www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You




Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI Conversions

TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

Reply
 
Thread Tools
Old February 28th, 2018, 12:45   #16
Inhabor
Newbie
 
Join Date: Feb 2018
Location: Florida
Default

Quote:
Originally Posted by markd89 View Post
FYI: I had a .70 and switched to a .77. I kinda wish I kept the .70. I'm also running much larger tires 16" 215 75 R16, You could still have sufficient power, drop RPMs and get more MPG with taller gears..
Well to be honest with you I have no idea of what those numbers mean. Lol I'm going with my trasmission expert recommended after I gave him the information that he asked for. I'm also getting LS
Inhabor is offline   Reply With Quote
Old February 28th, 2018, 16:24   #17
AndyBees
Veteran Member
 
AndyBees's Avatar
 
Join Date: May 2003
Location: Southeast Kentucky
Default

Inhabor, "slowing" down the TDI engine is important from at least two aspects.

1. With stock transmission gearing, the RPMs at 70 mph will be in the neighborhood of 3600. Unless you have extremely soft motor mounts and good sound-deadening, the noise inside the Bus will be very annoying.

2. Your TDI engine will be far more efficient and last much, much longer if the RPMs are below 3100 at 70 MPH.

I'm far from an expert on transmissions, but I did rebuild the tranny for my project. In fact, researching, rebuilding and re-gearing the tranny was one of the first things I did with my project.

I admit up front, I have very little knowledge or experience with pre-1980 Van/Bus transmissions.

My tranny is a 1980 model, first of the Vanagons, Code DK. It also has a 4.57 Ring and Pinion and come OE with a 0.85:1 4th gear ratio. I upgraded (taller) both 3rd and 4th gears. My 4th gear is a 0.77:1 as Markd89 referenced. I did the entire rebuild my self using over $1,000 in parts from Weddle Industries. Of course, I had to replace some damaged components which added about 1/3 to the cost. To date, I've driven it over 80k miles with no problems... shifts great.

I'm running 215/75/15 wheels/tires...

Take a look at the chart below showing Vanagon Transmissions. It doesn't apply to your Bus tranny, but it will give you some ideas. You can see the DK tranny and the original gearing and then at the bottom see my custom tranny.

Also, look at the chart, pick some ratios and apply to the Gear Ratio Calculator at Weddle https://weddleindustries.com/

And, at this web site, you can plug-in your tire size to learn about diameter, revolutions per mile, etc.... https://tiresize.com/calculator/

__________________
'84 Vanagon '02 ALH TDI engine Malone Stage 1 tune. CAT, SS 2" exhaust, E-vac system, DMF with upgrade pilot shaft, 4.57 R&P, fan assisted IC. (32 to 35+ MPGs consistently)
AndyBees is offline   Reply With Quote
Old February 28th, 2018, 17:18   #18
Inhabor
Newbie
 
Join Date: Feb 2018
Location: Florida
Default

Quote:
Originally Posted by AndyBees View Post
Inhabor, "slowing" down the TDI engine is important from at least two aspects.

1. With stock transmission gearing, the RPMs at 70 mph will be in the neighborhood of 3600. Unless you have extremely soft motor mounts and good sound-deadening, the noise inside the Bus will be very annoying.

2. Your TDI engine will be far more efficient and last much, much longer if the RPMs are below 3100 at 70 MPH.

I'm far from an expert on transmissions, but I did rebuild the tranny for my project. In fact, researching, rebuilding and re-gearing the tranny was one of the first things I did with my project.

I admit up front, I have very little knowledge or experience with pre-1980 Van/Bus transmissions.

My tranny is a 1980 model, first of the Vanagons, Code DK. It also has a 4.57 Ring and Pinion and come OE with a 0.85:1 4th gear ratio. I upgraded (taller) both 3rd and 4th gears. My 4th gear is a 0.77:1 as Markd89 referenced. I did the entire rebuild my self using over $1,000 in parts from Weddle Industries. Of course, I had to replace some damaged components which added about 1/3 to the cost. To date, I've driven it over 80k miles with no problems... shifts great.

I'm running 215/75/15 wheels/tires...

Take a look at the chart below showing Vanagon Transmissions. It doesn't apply to your Bus tranny, but it will give you some ideas. You can see the DK tranny and the original gearing and then at the bottom see my custom tranny.

Also, look at the chart, pick some ratios and apply to the Gear Ratio Calculator at Weddle https://weddleindustries.com/

And, at this web site, you can plug-in your tire size to learn about diameter, revolutions per mile, etc.... https://tiresize.com/calculator/

Thank you very much for the information.
Inhabor is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
VW Bus or Vanagon TDI conversion parts... Brad01mc Private TDI Items for Sale/Wanted 2 October 12th, 2009 17:25
VW Bus or Vanagon TDI conversion parts... Brad01mc TDI Conversions 7 October 11th, 2009 16:49
1968 VW Bus TDI Conversion BioBus TDI Conversions 1 July 6th, 2006 11:33
1971 Turbo Diesel VW Van/Bus BHarrison Other TDI/Diesel Picture Gallery 4 March 7th, 2006 10:29
T3 Bus TDI-conversion site CFriedriszik VW MKIV-A4 TDIs (VE and PD) 0 December 21st, 2000 08:38


All times are GMT -7. The time now is 23:57.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.12977 seconds with 12 queries
[Output: 63.54 Kb. compressed to 58.15 Kb. by saving 5.39 Kb. (8.49%)]